io.undertow.attribute.PredicateContextAttribute Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.attribute;
import java.util.Map;
import io.undertow.predicate.Predicate;
import io.undertow.server.HttpServerExchange;
/**
* @author Stuart Douglas
*/
public class PredicateContextAttribute implements ExchangeAttribute {
private final String name;
public PredicateContextAttribute(final String name) {
this.name = name;
}
@Override
public String readAttribute(final HttpServerExchange exchange) {
Map context = exchange.getAttachment(Predicate.PREDICATE_CONTEXT);
if (context != null) {
Object object = context.get(name);
return object == null ? null : object.toString();
}
return null;
}
@Override
public void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException {
Map context = exchange.getAttachment(Predicate.PREDICATE_CONTEXT);
if (context != null) {
context.put(name, newValue);
}
}
@Override
public String toString() {
return "${" + name + "}";
}
public static final class Builder implements ExchangeAttributeBuilder {
@Override
public String name() {
return "Predicate context variable";
}
@Override
public ExchangeAttribute build(final String token) {
if (token.startsWith("${") && token.endsWith("}") && token.length() > 3) {
return new PredicateContextAttribute(token.substring(2, token.length() - 1));
} else if (token.startsWith("$")) {
return new PredicateContextAttribute(token.substring(1, token.length()));
}
return null;
}
@Override
public int priority() {
return 0;
}
}
}